Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/lockd/svc.c | |
3 | * | |
4 | * This is the central lockd service. | |
5 | * | |
6 | * FIXME: Separate the lockd NFS server functionality from the lockd NFS | |
7 | * client functionality. Oh why didn't Sun create two separate | |
8 | * services in the first place? | |
9 | * | |
10 | * Authors: Olaf Kirch (okir@monad.swb.de) | |
11 | * | |
12 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/sysctl.h> | |
18 | #include <linux/moduleparam.h> | |
19 | ||
3f07c014 | 20 | #include <linux/sched/signal.h> |
1da177e4 LT |
21 | #include <linux/errno.h> |
22 | #include <linux/in.h> | |
23 | #include <linux/uio.h> | |
1da177e4 | 24 | #include <linux/smp.h> |
353ab6e9 | 25 | #include <linux/mutex.h> |
d751a7cd | 26 | #include <linux/kthread.h> |
83144186 | 27 | #include <linux/freezer.h> |
0751ddf7 | 28 | #include <linux/inetdevice.h> |
1da177e4 LT |
29 | |
30 | #include <linux/sunrpc/types.h> | |
31 | #include <linux/sunrpc/stats.h> | |
32 | #include <linux/sunrpc/clnt.h> | |
33 | #include <linux/sunrpc/svc.h> | |
34 | #include <linux/sunrpc/svcsock.h> | |
0751ddf7 | 35 | #include <linux/sunrpc/svc_xprt.h> |
24e36663 | 36 | #include <net/ip.h> |
0751ddf7 SM |
37 | #include <net/addrconf.h> |
38 | #include <net/ipv6.h> | |
1da177e4 LT |
39 | #include <linux/lockd/lockd.h> |
40 | #include <linux/nfs.h> | |
41 | ||
a9c5d73a | 42 | #include "netns.h" |
d68e3c4a | 43 | #include "procfs.h" |
a9c5d73a | 44 | |
1da177e4 LT |
45 | #define NLMDBG_FACILITY NLMDBG_SVC |
46 | #define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE) | |
47 | #define ALLOWED_SIGS (sigmask(SIGKILL)) | |
48 | ||
49 | static struct svc_program nlmsvc_program; | |
50 | ||
2a297450 | 51 | const struct nlmsvc_binding *nlmsvc_ops; |
2de59872 | 52 | EXPORT_SYMBOL_GPL(nlmsvc_ops); |
1da177e4 | 53 | |
353ab6e9 | 54 | static DEFINE_MUTEX(nlmsvc_mutex); |
1da177e4 | 55 | static unsigned int nlmsvc_users; |
d751a7cd | 56 | static struct task_struct *nlmsvc_task; |
abd1ec4e | 57 | static struct svc_rqst *nlmsvc_rqst; |
1da177e4 LT |
58 | unsigned long nlmsvc_timeout; |
59 | ||
554faf28 CIK |
60 | static atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0); |
61 | static DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq); | |
6b18dd1c | 62 | |
c7d03a00 | 63 | unsigned int lockd_net_id; |
a9c5d73a | 64 | |
1da177e4 LT |
65 | /* |
66 | * These can be set at insmod time (useful for NFS as root filesystem), | |
67 | * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003 | |
68 | */ | |
69 | static unsigned long nlm_grace_period; | |
70 | static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO; | |
71 | static int nlm_udpport, nlm_tcpport; | |
72 | ||
c72a476b JL |
73 | /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */ |
74 | static unsigned int nlm_max_connections = 1024; | |
75 | ||
1da177e4 LT |
76 | /* |
77 | * Constants needed for the sysctl interface. | |
78 | */ | |
79 | static const unsigned long nlm_grace_period_min = 0; | |
80 | static const unsigned long nlm_grace_period_max = 240; | |
81 | static const unsigned long nlm_timeout_min = 3; | |
82 | static const unsigned long nlm_timeout_max = 20; | |
83 | static const int nlm_port_min = 0, nlm_port_max = 65535; | |
84 | ||
90d5b180 | 85 | #ifdef CONFIG_SYSCTL |
1da177e4 | 86 | static struct ctl_table_header * nlm_sysctl_table; |
90d5b180 | 87 | #endif |
1da177e4 | 88 | |
9a8db97e | 89 | static unsigned long get_lockd_grace_period(void) |
1da177e4 | 90 | { |
1da177e4 LT |
91 | /* Note: nlm_timeout should always be nonzero */ |
92 | if (nlm_grace_period) | |
9a8db97e | 93 | return roundup(nlm_grace_period, nlm_timeout) * HZ; |
1da177e4 | 94 | else |
9a8db97e ME |
95 | return nlm_timeout * 5 * HZ; |
96 | } | |
97 | ||
08d44a35 | 98 | static void grace_ender(struct work_struct *grace) |
9a8db97e | 99 | { |
ea44463f | 100 | struct delayed_work *dwork = to_delayed_work(grace); |
08d44a35 SK |
101 | struct lockd_net *ln = container_of(dwork, struct lockd_net, |
102 | grace_period_end); | |
103 | ||
104 | locks_end_grace(&ln->lockd_manager); | |
1da177e4 LT |
105 | } |
106 | ||
5ccb0066 | 107 | static void set_grace_period(struct net *net) |
1da177e4 | 108 | { |
af558e33 | 109 | unsigned long grace_period = get_lockd_grace_period(); |
5ccb0066 | 110 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
c8ab5f2a | 111 | |
5ccb0066 | 112 | locks_start_grace(net, &ln->lockd_manager); |
66547b02 SK |
113 | cancel_delayed_work_sync(&ln->grace_period_end); |
114 | schedule_delayed_work(&ln->grace_period_end, grace_period); | |
1da177e4 LT |
115 | } |
116 | ||
89996df4 BF |
117 | static void restart_grace(void) |
118 | { | |
119 | if (nlmsvc_ops) { | |
5ccb0066 SK |
120 | struct net *net = &init_net; |
121 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
66547b02 SK |
122 | |
123 | cancel_delayed_work_sync(&ln->grace_period_end); | |
08d44a35 | 124 | locks_end_grace(&ln->lockd_manager); |
89996df4 | 125 | nlmsvc_invalidate_all(); |
5ccb0066 | 126 | set_grace_period(net); |
89996df4 BF |
127 | } |
128 | } | |
129 | ||
1da177e4 LT |
130 | /* |
131 | * This is the lockd kernel thread | |
132 | */ | |
d751a7cd JL |
133 | static int |
134 | lockd(void *vrqstp) | |
1da177e4 | 135 | { |
5b444cc9 | 136 | int err = 0; |
d751a7cd | 137 | struct svc_rqst *rqstp = vrqstp; |
efda760f BF |
138 | struct net *net = &init_net; |
139 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
1da177e4 | 140 | |
d751a7cd | 141 | /* try_to_freeze() is called from svc_recv() */ |
83144186 | 142 | set_freezable(); |
1da177e4 | 143 | |
d751a7cd | 144 | /* Allow SIGKILL to tell lockd to drop all of its locks */ |
1da177e4 LT |
145 | allow_signal(SIGKILL); |
146 | ||
1da177e4 LT |
147 | dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n"); |
148 | ||
1da177e4 LT |
149 | /* |
150 | * The main request loop. We don't terminate until the last | |
d751a7cd | 151 | * NFS mount or NFS daemon has gone away. |
1da177e4 | 152 | */ |
d751a7cd | 153 | while (!kthread_should_stop()) { |
1da177e4 | 154 | long timeout = MAX_SCHEDULE_TIMEOUT; |
5216a8e7 | 155 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
1da177e4 | 156 | |
c72a476b JL |
157 | /* update sv_maxconn if it has changed */ |
158 | rqstp->rq_server->sv_maxconn = nlm_max_connections; | |
159 | ||
1da177e4 LT |
160 | if (signalled()) { |
161 | flush_signals(current); | |
89996df4 | 162 | restart_grace(); |
d751a7cd | 163 | continue; |
1da177e4 LT |
164 | } |
165 | ||
8fafa900 BF |
166 | timeout = nlmsvc_retry_blocked(); |
167 | ||
1da177e4 LT |
168 | /* |
169 | * Find a socket with data available and call its | |
170 | * recvfrom routine. | |
171 | */ | |
6fb2b47f | 172 | err = svc_recv(rqstp, timeout); |
5b444cc9 | 173 | if (err == -EAGAIN || err == -EINTR) |
1da177e4 | 174 | continue; |
ad06e4bd CL |
175 | dprintk("lockd: request from %s\n", |
176 | svc_print_addr(rqstp, buf, sizeof(buf))); | |
1da177e4 | 177 | |
6fb2b47f | 178 | svc_process(rqstp); |
1da177e4 | 179 | } |
2bd61579 | 180 | flush_signals(current); |
d751a7cd JL |
181 | if (nlmsvc_ops) |
182 | nlmsvc_invalidate_all(); | |
183 | nlm_shutdown_hosts(); | |
efda760f BF |
184 | cancel_delayed_work_sync(&ln->grace_period_end); |
185 | locks_end_grace(&ln->lockd_manager); | |
d751a7cd | 186 | return 0; |
1da177e4 LT |
187 | } |
188 | ||
eb16e907 | 189 | static int create_lockd_listener(struct svc_serv *serv, const char *name, |
c228fa20 SK |
190 | struct net *net, const int family, |
191 | const unsigned short port) | |
d3fe5ea7 CL |
192 | { |
193 | struct svc_xprt *xprt; | |
194 | ||
c228fa20 | 195 | xprt = svc_find_xprt(serv, name, net, family, 0); |
d3fe5ea7 | 196 | if (xprt == NULL) |
c228fa20 | 197 | return svc_create_xprt(serv, name, net, family, port, |
eb16e907 | 198 | SVC_SOCK_DEFAULTS); |
d3fe5ea7 CL |
199 | svc_xprt_put(xprt); |
200 | return 0; | |
201 | } | |
202 | ||
c228fa20 SK |
203 | static int create_lockd_family(struct svc_serv *serv, struct net *net, |
204 | const int family) | |
eb16e907 CL |
205 | { |
206 | int err; | |
207 | ||
c228fa20 | 208 | err = create_lockd_listener(serv, "udp", net, family, nlm_udpport); |
eb16e907 CL |
209 | if (err < 0) |
210 | return err; | |
211 | ||
c228fa20 | 212 | return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport); |
eb16e907 CL |
213 | } |
214 | ||
482fb94e | 215 | /* |
8c3916f4 CL |
216 | * Ensure there are active UDP and TCP listeners for lockd. |
217 | * | |
218 | * Even if we have only TCP NFS mounts and/or TCP NFSDs, some | |
219 | * local services (such as rpc.statd) still require UDP, and | |
220 | * some NFS servers do not yet support NLM over TCP. | |
221 | * | |
222 | * Returns zero if all listeners are available; otherwise a | |
223 | * negative errno value is returned. | |
482fb94e | 224 | */ |
c228fa20 | 225 | static int make_socks(struct svc_serv *serv, struct net *net) |
24e36663 | 226 | { |
482fb94e | 227 | static int warned; |
0dba7c2a | 228 | int err; |
482fb94e | 229 | |
c228fa20 | 230 | err = create_lockd_family(serv, net, PF_INET); |
0dba7c2a CL |
231 | if (err < 0) |
232 | goto out_err; | |
233 | ||
c228fa20 | 234 | err = create_lockd_family(serv, net, PF_INET6); |
eb16e907 | 235 | if (err < 0 && err != -EAFNOSUPPORT) |
0dba7c2a CL |
236 | goto out_err; |
237 | ||
238 | warned = 0; | |
239 | return 0; | |
240 | ||
241 | out_err: | |
242 | if (warned++ == 0) | |
7dcf91ec | 243 | printk(KERN_WARNING |
0dba7c2a | 244 | "lockd_up: makesock failed, error=%d\n", err); |
679b033d | 245 | svc_shutdown_net(serv, net); |
24e36663 N |
246 | return err; |
247 | } | |
248 | ||
4db77695 | 249 | static int lockd_up_net(struct svc_serv *serv, struct net *net) |
bb2224df SK |
250 | { |
251 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
bb2224df SK |
252 | int error; |
253 | ||
786185b5 | 254 | if (ln->nlmsvc_users++) |
bb2224df SK |
255 | return 0; |
256 | ||
dbf9b5d7 | 257 | error = svc_bind(serv, net); |
bb2224df | 258 | if (error) |
dbf9b5d7 | 259 | goto err_bind; |
bb2224df SK |
260 | |
261 | error = make_socks(serv, net); | |
262 | if (error < 0) | |
7c17705e | 263 | goto err_bind; |
5630f7fa | 264 | set_grace_period(net); |
e919b076 | 265 | dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum); |
bb2224df SK |
266 | return 0; |
267 | ||
dbf9b5d7 | 268 | err_bind: |
786185b5 | 269 | ln->nlmsvc_users--; |
bb2224df SK |
270 | return error; |
271 | } | |
272 | ||
4db77695 | 273 | static void lockd_down_net(struct svc_serv *serv, struct net *net) |
bb2224df SK |
274 | { |
275 | struct lockd_net *ln = net_generic(net, lockd_net_id); | |
bb2224df SK |
276 | |
277 | if (ln->nlmsvc_users) { | |
3b64739f SK |
278 | if (--ln->nlmsvc_users == 0) { |
279 | nlm_shutdown_hosts_net(net); | |
3a2b19d1 VA |
280 | cancel_delayed_work_sync(&ln->grace_period_end); |
281 | locks_end_grace(&ln->lockd_manager); | |
bb2224df | 282 | svc_shutdown_net(serv, net); |
e919b076 VA |
283 | dprintk("%s: per-net data destroyed; net=%x\n", |
284 | __func__, net->ns.inum); | |
3b64739f | 285 | } |
bb2224df | 286 | } else { |
e919b076 VA |
287 | pr_err("%s: no users! task=%p, net=%x\n", |
288 | __func__, nlmsvc_task, net->ns.inum); | |
bb2224df SK |
289 | BUG(); |
290 | } | |
291 | } | |
292 | ||
0751ddf7 SM |
293 | static int lockd_inetaddr_event(struct notifier_block *this, |
294 | unsigned long event, void *ptr) | |
295 | { | |
296 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; | |
297 | struct sockaddr_in sin; | |
298 | ||
6b18dd1c VA |
299 | if ((event != NETDEV_DOWN) || |
300 | !atomic_inc_not_zero(&nlm_ntf_refcnt)) | |
0751ddf7 SM |
301 | goto out; |
302 | ||
303 | if (nlmsvc_rqst) { | |
304 | dprintk("lockd_inetaddr_event: removed %pI4\n", | |
305 | &ifa->ifa_local); | |
306 | sin.sin_family = AF_INET; | |
307 | sin.sin_addr.s_addr = ifa->ifa_local; | |
308 | svc_age_temp_xprts_now(nlmsvc_rqst->rq_server, | |
309 | (struct sockaddr *)&sin); | |
310 | } | |
6b18dd1c VA |
311 | atomic_dec(&nlm_ntf_refcnt); |
312 | wake_up(&nlm_ntf_wq); | |
0751ddf7 SM |
313 | |
314 | out: | |
315 | return NOTIFY_DONE; | |
316 | } | |
317 | ||
318 | static struct notifier_block lockd_inetaddr_notifier = { | |
319 | .notifier_call = lockd_inetaddr_event, | |
320 | }; | |
321 | ||
322 | #if IS_ENABLED(CONFIG_IPV6) | |
323 | static int lockd_inet6addr_event(struct notifier_block *this, | |
324 | unsigned long event, void *ptr) | |
325 | { | |
326 | struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; | |
327 | struct sockaddr_in6 sin6; | |
328 | ||
6b18dd1c VA |
329 | if ((event != NETDEV_DOWN) || |
330 | !atomic_inc_not_zero(&nlm_ntf_refcnt)) | |
0751ddf7 SM |
331 | goto out; |
332 | ||
333 | if (nlmsvc_rqst) { | |
334 | dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr); | |
335 | sin6.sin6_family = AF_INET6; | |
336 | sin6.sin6_addr = ifa->addr; | |
c01410f7 SM |
337 | if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
338 | sin6.sin6_scope_id = ifa->idev->dev->ifindex; | |
0751ddf7 SM |
339 | svc_age_temp_xprts_now(nlmsvc_rqst->rq_server, |
340 | (struct sockaddr *)&sin6); | |
341 | } | |
6b18dd1c VA |
342 | atomic_dec(&nlm_ntf_refcnt); |
343 | wake_up(&nlm_ntf_wq); | |
0751ddf7 SM |
344 | |
345 | out: | |
346 | return NOTIFY_DONE; | |
347 | } | |
348 | ||
349 | static struct notifier_block lockd_inet6addr_notifier = { | |
350 | .notifier_call = lockd_inet6addr_event, | |
351 | }; | |
352 | #endif | |
353 | ||
cb7d224f | 354 | static void lockd_unregister_notifiers(void) |
0751ddf7 SM |
355 | { |
356 | unregister_inetaddr_notifier(&lockd_inetaddr_notifier); | |
357 | #if IS_ENABLED(CONFIG_IPV6) | |
358 | unregister_inet6addr_notifier(&lockd_inet6addr_notifier); | |
359 | #endif | |
6b18dd1c | 360 | wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0); |
cb7d224f SM |
361 | } |
362 | ||
363 | static void lockd_svc_exit_thread(void) | |
364 | { | |
6b18dd1c | 365 | atomic_dec(&nlm_ntf_refcnt); |
cb7d224f | 366 | lockd_unregister_notifiers(); |
0751ddf7 SM |
367 | svc_exit_thread(nlmsvc_rqst); |
368 | } | |
369 | ||
3d1221df SK |
370 | static int lockd_start_svc(struct svc_serv *serv) |
371 | { | |
372 | int error; | |
373 | ||
374 | if (nlmsvc_rqst) | |
375 | return 0; | |
376 | ||
377 | /* | |
378 | * Create the kernel thread and wait for it to start. | |
379 | */ | |
380 | nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE); | |
381 | if (IS_ERR(nlmsvc_rqst)) { | |
382 | error = PTR_ERR(nlmsvc_rqst); | |
383 | printk(KERN_WARNING | |
384 | "lockd_up: svc_rqst allocation failed, error=%d\n", | |
385 | error); | |
dc3033e1 | 386 | lockd_unregister_notifiers(); |
3d1221df SK |
387 | goto out_rqst; |
388 | } | |
389 | ||
6b18dd1c | 390 | atomic_inc(&nlm_ntf_refcnt); |
3d1221df SK |
391 | svc_sock_update_bufs(serv); |
392 | serv->sv_maxconn = nlm_max_connections; | |
393 | ||
d4e89902 | 394 | nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name); |
3d1221df SK |
395 | if (IS_ERR(nlmsvc_task)) { |
396 | error = PTR_ERR(nlmsvc_task); | |
397 | printk(KERN_WARNING | |
398 | "lockd_up: kthread_run failed, error=%d\n", error); | |
399 | goto out_task; | |
400 | } | |
d6a7ce42 | 401 | nlmsvc_rqst->rq_task = nlmsvc_task; |
d4e89902 | 402 | wake_up_process(nlmsvc_task); |
d6a7ce42 | 403 | |
3d1221df SK |
404 | dprintk("lockd_up: service started\n"); |
405 | return 0; | |
406 | ||
407 | out_task: | |
0751ddf7 | 408 | lockd_svc_exit_thread(); |
3d1221df SK |
409 | nlmsvc_task = NULL; |
410 | out_rqst: | |
411 | nlmsvc_rqst = NULL; | |
412 | return error; | |
413 | } | |
414 | ||
afea5657 | 415 | static const struct svc_serv_ops lockd_sv_ops = { |
b9e13cdf JL |
416 | .svo_shutdown = svc_rpcb_cleanup, |
417 | .svo_enqueue_xprt = svc_xprt_do_enqueue, | |
ea126e74 JL |
418 | }; |
419 | ||
24452239 | 420 | static struct svc_serv *lockd_create_svc(void) |
1da177e4 | 421 | { |
d751a7cd | 422 | struct svc_serv *serv; |
1da177e4 | 423 | |
1da177e4 LT |
424 | /* |
425 | * Check whether we're already up and running. | |
426 | */ | |
bb2224df | 427 | if (nlmsvc_rqst) { |
24452239 SK |
428 | /* |
429 | * Note: increase service usage, because later in case of error | |
430 | * svc_destroy() will be called. | |
431 | */ | |
432 | svc_get(nlmsvc_rqst->rq_server); | |
433 | return nlmsvc_rqst->rq_server; | |
bb2224df | 434 | } |
1da177e4 LT |
435 | |
436 | /* | |
437 | * Sanity check: if there's no pid, | |
438 | * we should be the first user ... | |
439 | */ | |
4a3ae42d | 440 | if (nlmsvc_users) |
1da177e4 LT |
441 | printk(KERN_WARNING |
442 | "lockd_up: no pid, %d users??\n", nlmsvc_users); | |
443 | ||
06bed7d1 TM |
444 | if (!nlm_timeout) |
445 | nlm_timeout = LOCKD_DFLT_TIMEO; | |
446 | nlmsvc_timeout = nlm_timeout * HZ; | |
447 | ||
ea126e74 | 448 | serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops); |
1da177e4 LT |
449 | if (!serv) { |
450 | printk(KERN_WARNING "lockd_up: create service failed\n"); | |
24452239 SK |
451 | return ERR_PTR(-ENOMEM); |
452 | } | |
0751ddf7 SM |
453 | register_inetaddr_notifier(&lockd_inetaddr_notifier); |
454 | #if IS_ENABLED(CONFIG_IPV6) | |
455 | register_inet6addr_notifier(&lockd_inet6addr_notifier); | |
456 | #endif | |
8dbf28e4 | 457 | dprintk("lockd_up: service created\n"); |
24452239 SK |
458 | return serv; |
459 | } | |
460 | ||
461 | /* | |
462 | * Bring up the lockd process if it's not already up. | |
463 | */ | |
464 | int lockd_up(struct net *net) | |
465 | { | |
466 | struct svc_serv *serv; | |
7d13ec76 | 467 | int error; |
24452239 SK |
468 | |
469 | mutex_lock(&nlmsvc_mutex); | |
470 | ||
471 | serv = lockd_create_svc(); | |
472 | if (IS_ERR(serv)) { | |
473 | error = PTR_ERR(serv); | |
474 | goto err_create; | |
1da177e4 LT |
475 | } |
476 | ||
dbf9b5d7 | 477 | error = lockd_up_net(serv, net); |
dc3033e1 VA |
478 | if (error < 0) { |
479 | lockd_unregister_notifiers(); | |
480 | goto err_put; | |
481 | } | |
1da177e4 | 482 | |
3d1221df | 483 | error = lockd_start_svc(serv); |
dc3033e1 VA |
484 | if (error < 0) { |
485 | lockd_down_net(serv, net); | |
486 | goto err_put; | |
487 | } | |
7d13ec76 | 488 | nlmsvc_users++; |
1da177e4 LT |
489 | /* |
490 | * Note: svc_serv structures have an initial use count of 1, | |
491 | * so we exit through here on both success and failure. | |
492 | */ | |
cb7d224f | 493 | err_put: |
1da177e4 | 494 | svc_destroy(serv); |
24452239 | 495 | err_create: |
353ab6e9 | 496 | mutex_unlock(&nlmsvc_mutex); |
1da177e4 LT |
497 | return error; |
498 | } | |
2de59872 | 499 | EXPORT_SYMBOL_GPL(lockd_up); |
1da177e4 LT |
500 | |
501 | /* | |
502 | * Decrement the user count and bring down lockd if we're the last. | |
503 | */ | |
504 | void | |
e3f70ead | 505 | lockd_down(struct net *net) |
1da177e4 | 506 | { |
353ab6e9 | 507 | mutex_lock(&nlmsvc_mutex); |
4db77695 | 508 | lockd_down_net(nlmsvc_rqst->rq_server, net); |
1da177e4 | 509 | if (nlmsvc_users) { |
786185b5 | 510 | if (--nlmsvc_users) |
1da177e4 | 511 | goto out; |
d751a7cd JL |
512 | } else { |
513 | printk(KERN_ERR "lockd_down: no users! task=%p\n", | |
514 | nlmsvc_task); | |
515 | BUG(); | |
1da177e4 | 516 | } |
1da177e4 | 517 | |
d751a7cd JL |
518 | if (!nlmsvc_task) { |
519 | printk(KERN_ERR "lockd_down: no lockd running.\n"); | |
520 | BUG(); | |
1da177e4 | 521 | } |
d751a7cd | 522 | kthread_stop(nlmsvc_task); |
8dbf28e4 | 523 | dprintk("lockd_down: service stopped\n"); |
0751ddf7 | 524 | lockd_svc_exit_thread(); |
8dbf28e4 | 525 | dprintk("lockd_down: service destroyed\n"); |
abd1ec4e JL |
526 | nlmsvc_task = NULL; |
527 | nlmsvc_rqst = NULL; | |
1da177e4 | 528 | out: |
353ab6e9 | 529 | mutex_unlock(&nlmsvc_mutex); |
1da177e4 | 530 | } |
2de59872 | 531 | EXPORT_SYMBOL_GPL(lockd_down); |
1da177e4 | 532 | |
90d5b180 CL |
533 | #ifdef CONFIG_SYSCTL |
534 | ||
1da177e4 LT |
535 | /* |
536 | * Sysctl parameters (same as module parameters, different interface). | |
537 | */ | |
538 | ||
7ac9fe57 | 539 | static struct ctl_table nlm_sysctls[] = { |
1da177e4 | 540 | { |
1da177e4 LT |
541 | .procname = "nlm_grace_period", |
542 | .data = &nlm_grace_period, | |
7ee91ec1 | 543 | .maxlen = sizeof(unsigned long), |
1da177e4 | 544 | .mode = 0644, |
6d456111 | 545 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 LT |
546 | .extra1 = (unsigned long *) &nlm_grace_period_min, |
547 | .extra2 = (unsigned long *) &nlm_grace_period_max, | |
548 | }, | |
549 | { | |
1da177e4 LT |
550 | .procname = "nlm_timeout", |
551 | .data = &nlm_timeout, | |
7ee91ec1 | 552 | .maxlen = sizeof(unsigned long), |
1da177e4 | 553 | .mode = 0644, |
6d456111 | 554 | .proc_handler = proc_doulongvec_minmax, |
1da177e4 LT |
555 | .extra1 = (unsigned long *) &nlm_timeout_min, |
556 | .extra2 = (unsigned long *) &nlm_timeout_max, | |
557 | }, | |
558 | { | |
1da177e4 LT |
559 | .procname = "nlm_udpport", |
560 | .data = &nlm_udpport, | |
561 | .maxlen = sizeof(int), | |
562 | .mode = 0644, | |
6d456111 | 563 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
564 | .extra1 = (int *) &nlm_port_min, |
565 | .extra2 = (int *) &nlm_port_max, | |
566 | }, | |
567 | { | |
1da177e4 LT |
568 | .procname = "nlm_tcpport", |
569 | .data = &nlm_tcpport, | |
570 | .maxlen = sizeof(int), | |
571 | .mode = 0644, | |
6d456111 | 572 | .proc_handler = proc_dointvec_minmax, |
1da177e4 LT |
573 | .extra1 = (int *) &nlm_port_min, |
574 | .extra2 = (int *) &nlm_port_max, | |
575 | }, | |
abd1f500 | 576 | { |
abd1f500 OK |
577 | .procname = "nsm_use_hostnames", |
578 | .data = &nsm_use_hostnames, | |
579 | .maxlen = sizeof(int), | |
580 | .mode = 0644, | |
6d456111 | 581 | .proc_handler = proc_dointvec, |
abd1f500 | 582 | }, |
460f5cac | 583 | { |
460f5cac OK |
584 | .procname = "nsm_local_state", |
585 | .data = &nsm_local_state, | |
586 | .maxlen = sizeof(int), | |
587 | .mode = 0644, | |
6d456111 | 588 | .proc_handler = proc_dointvec, |
460f5cac | 589 | }, |
ab09203e | 590 | { } |
1da177e4 LT |
591 | }; |
592 | ||
7ac9fe57 | 593 | static struct ctl_table nlm_sysctl_dir[] = { |
1da177e4 | 594 | { |
1da177e4 LT |
595 | .procname = "nfs", |
596 | .mode = 0555, | |
597 | .child = nlm_sysctls, | |
598 | }, | |
ab09203e | 599 | { } |
1da177e4 LT |
600 | }; |
601 | ||
7ac9fe57 | 602 | static struct ctl_table nlm_sysctl_root[] = { |
1da177e4 | 603 | { |
1da177e4 LT |
604 | .procname = "fs", |
605 | .mode = 0555, | |
606 | .child = nlm_sysctl_dir, | |
607 | }, | |
ab09203e | 608 | { } |
1da177e4 LT |
609 | }; |
610 | ||
90d5b180 CL |
611 | #endif /* CONFIG_SYSCTL */ |
612 | ||
1da177e4 | 613 | /* |
405ae7d3 | 614 | * Module (and sysfs) parameters. |
1da177e4 LT |
615 | */ |
616 | ||
617 | #define param_set_min_max(name, type, which_strtol, min, max) \ | |
e4dca7b7 | 618 | static int param_set_##name(const char *val, const struct kernel_param *kp) \ |
1da177e4 LT |
619 | { \ |
620 | char *endp; \ | |
621 | __typeof__(type) num = which_strtol(val, &endp, 0); \ | |
622 | if (endp == val || *endp || num < (min) || num > (max)) \ | |
623 | return -EINVAL; \ | |
de5b8e8e | 624 | *((type *) kp->arg) = num; \ |
1da177e4 LT |
625 | return 0; \ |
626 | } | |
627 | ||
628 | static inline int is_callback(u32 proc) | |
629 | { | |
630 | return proc == NLMPROC_GRANTED | |
631 | || proc == NLMPROC_GRANTED_MSG | |
632 | || proc == NLMPROC_TEST_RES | |
633 | || proc == NLMPROC_LOCK_RES | |
634 | || proc == NLMPROC_CANCEL_RES | |
635 | || proc == NLMPROC_UNLOCK_RES | |
636 | || proc == NLMPROC_NSM_NOTIFY; | |
637 | } | |
638 | ||
639 | ||
640 | static int lockd_authenticate(struct svc_rqst *rqstp) | |
641 | { | |
642 | rqstp->rq_client = NULL; | |
643 | switch (rqstp->rq_authop->flavour) { | |
644 | case RPC_AUTH_NULL: | |
645 | case RPC_AUTH_UNIX: | |
646 | if (rqstp->rq_proc == 0) | |
647 | return SVC_OK; | |
648 | if (is_callback(rqstp->rq_proc)) { | |
649 | /* Leave it to individual procedures to | |
650 | * call nlmsvc_lookup_host(rqstp) | |
651 | */ | |
652 | return SVC_OK; | |
653 | } | |
654 | return svc_set_client(rqstp); | |
655 | } | |
656 | return SVC_DENIED; | |
657 | } | |
658 | ||
659 | ||
660 | param_set_min_max(port, int, simple_strtol, 0, 65535) | |
661 | param_set_min_max(grace_period, unsigned long, simple_strtoul, | |
662 | nlm_grace_period_min, nlm_grace_period_max) | |
663 | param_set_min_max(timeout, unsigned long, simple_strtoul, | |
664 | nlm_timeout_min, nlm_timeout_max) | |
665 | ||
666 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); | |
667 | MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION "."); | |
668 | MODULE_LICENSE("GPL"); | |
669 | ||
670 | module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong, | |
671 | &nlm_grace_period, 0644); | |
672 | module_param_call(nlm_timeout, param_set_timeout, param_get_ulong, | |
673 | &nlm_timeout, 0644); | |
674 | module_param_call(nlm_udpport, param_set_port, param_get_int, | |
675 | &nlm_udpport, 0644); | |
676 | module_param_call(nlm_tcpport, param_set_port, param_get_int, | |
677 | &nlm_tcpport, 0644); | |
abd1f500 | 678 | module_param(nsm_use_hostnames, bool, 0644); |
c72a476b | 679 | module_param(nlm_max_connections, uint, 0644); |
1da177e4 | 680 | |
a9c5d73a SK |
681 | static int lockd_init_net(struct net *net) |
682 | { | |
66547b02 SK |
683 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
684 | ||
685 | INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender); | |
f7790029 | 686 | INIT_LIST_HEAD(&ln->lockd_manager.list); |
c87fb4a3 | 687 | ln->lockd_manager.block_opens = false; |
0ad95472 | 688 | INIT_LIST_HEAD(&ln->nsm_handles); |
a9c5d73a SK |
689 | return 0; |
690 | } | |
691 | ||
692 | static void lockd_exit_net(struct net *net) | |
693 | { | |
a3152f14 VA |
694 | struct lockd_net *ln = net_generic(net, lockd_net_id); |
695 | ||
696 | WARN_ONCE(!list_empty(&ln->lockd_manager.list), | |
697 | "net %x %s: lockd_manager.list is not empty\n", | |
698 | net->ns.inum, __func__); | |
699 | WARN_ONCE(!list_empty(&ln->nsm_handles), | |
700 | "net %x %s: nsm_handles list is not empty\n", | |
701 | net->ns.inum, __func__); | |
702 | WARN_ONCE(delayed_work_pending(&ln->grace_period_end), | |
703 | "net %x %s: grace_period_end was not cancelled\n", | |
704 | net->ns.inum, __func__); | |
a9c5d73a SK |
705 | } |
706 | ||
707 | static struct pernet_operations lockd_net_ops = { | |
708 | .init = lockd_init_net, | |
709 | .exit = lockd_exit_net, | |
710 | .id = &lockd_net_id, | |
711 | .size = sizeof(struct lockd_net), | |
712 | }; | |
713 | ||
714 | ||
1da177e4 LT |
715 | /* |
716 | * Initialising and terminating the module. | |
717 | */ | |
718 | ||
719 | static int __init init_nlm(void) | |
720 | { | |
a9c5d73a SK |
721 | int err; |
722 | ||
90d5b180 | 723 | #ifdef CONFIG_SYSCTL |
a9c5d73a | 724 | err = -ENOMEM; |
0b4d4147 | 725 | nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root); |
a9c5d73a SK |
726 | if (nlm_sysctl_table == NULL) |
727 | goto err_sysctl; | |
728 | #endif | |
729 | err = register_pernet_subsys(&lockd_net_ops); | |
730 | if (err) | |
731 | goto err_pernet; | |
d68e3c4a JL |
732 | |
733 | err = lockd_create_procfs(); | |
734 | if (err) | |
735 | goto err_procfs; | |
736 | ||
90d5b180 | 737 | return 0; |
a9c5d73a | 738 | |
d68e3c4a JL |
739 | err_procfs: |
740 | unregister_pernet_subsys(&lockd_net_ops); | |
a9c5d73a SK |
741 | err_pernet: |
742 | #ifdef CONFIG_SYSCTL | |
743 | unregister_sysctl_table(nlm_sysctl_table); | |
a9c5d73a | 744 | err_sysctl: |
12dd7ecf | 745 | #endif |
a9c5d73a | 746 | return err; |
1da177e4 LT |
747 | } |
748 | ||
749 | static void __exit exit_nlm(void) | |
750 | { | |
751 | /* FIXME: delete all NLM clients */ | |
752 | nlm_shutdown_hosts(); | |
d68e3c4a | 753 | lockd_remove_procfs(); |
a9c5d73a | 754 | unregister_pernet_subsys(&lockd_net_ops); |
90d5b180 | 755 | #ifdef CONFIG_SYSCTL |
1da177e4 | 756 | unregister_sysctl_table(nlm_sysctl_table); |
90d5b180 | 757 | #endif |
1da177e4 LT |
758 | } |
759 | ||
760 | module_init(init_nlm); | |
761 | module_exit(exit_nlm); | |
762 | ||
763 | /* | |
764 | * Define NLM program and procedures | |
765 | */ | |
7fd38af9 | 766 | static unsigned int nlmsvc_version1_count[17]; |
e9679189 CH |
767 | static const struct svc_version nlmsvc_version1 = { |
768 | .vs_vers = 1, | |
769 | .vs_nproc = 17, | |
770 | .vs_proc = nlmsvc_procedures, | |
771 | .vs_count = nlmsvc_version1_count, | |
772 | .vs_xdrsize = NLMSVC_XDRSIZE, | |
1da177e4 | 773 | }; |
7fd38af9 | 774 | static unsigned int nlmsvc_version3_count[24]; |
e9679189 CH |
775 | static const struct svc_version nlmsvc_version3 = { |
776 | .vs_vers = 3, | |
777 | .vs_nproc = 24, | |
778 | .vs_proc = nlmsvc_procedures, | |
779 | .vs_count = nlmsvc_version3_count, | |
780 | .vs_xdrsize = NLMSVC_XDRSIZE, | |
1da177e4 LT |
781 | }; |
782 | #ifdef CONFIG_LOCKD_V4 | |
7fd38af9 | 783 | static unsigned int nlmsvc_version4_count[24]; |
e9679189 CH |
784 | static const struct svc_version nlmsvc_version4 = { |
785 | .vs_vers = 4, | |
786 | .vs_nproc = 24, | |
787 | .vs_proc = nlmsvc_procedures4, | |
788 | .vs_count = nlmsvc_version4_count, | |
789 | .vs_xdrsize = NLMSVC_XDRSIZE, | |
1da177e4 LT |
790 | }; |
791 | #endif | |
e9679189 | 792 | static const struct svc_version *nlmsvc_version[] = { |
1da177e4 LT |
793 | [1] = &nlmsvc_version1, |
794 | [3] = &nlmsvc_version3, | |
795 | #ifdef CONFIG_LOCKD_V4 | |
796 | [4] = &nlmsvc_version4, | |
797 | #endif | |
798 | }; | |
799 | ||
800 | static struct svc_stat nlmsvc_stats; | |
801 | ||
e8c96f8c | 802 | #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version) |
1da177e4 LT |
803 | static struct svc_program nlmsvc_program = { |
804 | .pg_prog = NLM_PROGRAM, /* program number */ | |
805 | .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */ | |
806 | .pg_vers = nlmsvc_version, /* version table */ | |
807 | .pg_name = "lockd", /* service name */ | |
808 | .pg_class = "nfsd", /* share authentication with nfsd */ | |
809 | .pg_stats = &nlmsvc_stats, /* stats table */ | |
810 | .pg_authenticate = &lockd_authenticate /* export authentication */ | |
811 | }; |